I think that's not the thing. Banning bitcoin will lower down a country's reputation, as cryptocurrencies are for the open and free society in economic realm. However, that doesn't mean btc will encourage transparency, as the currency is pseudonymous and is in fact a lot more suited to people who don't want to show their money than fiat. In my country some politicians already hold huge sums of btc and claim they've invested in them a lot earlier and this way people can't accuse them of having to much money (which is actually obviously there from corruption).